DAO 111:173-176 (2014)  -  DOI: https://doi.org/10.3354/dao02746

NOTE
Spontaneous multicentric myxoma of the dermal nerve sheaths in farmed European eels Anguilla anguilla

E. Gjurčević1, S. Kužir2, A. Sfacteria3, K. Drašner4, F. Marino3,*

1Department for Biology and Pathology of Fish and Bees, Faculty of Veterinary Medicine, University of Zagreb, 10000 Zagreb, Croatia
2Department of Anatomy, Histology and Embryology, Faculty of Veterinary Medicine, University of Zagreb, 10000 Zagreb, Croatia
3Department of Veterinary Sciences, Centro di Ittiopatologia Sperimentale della Sicilia, University of Messina, Polo Universitario dell’Annunziata, 98168 Messina, Italy
4Fish Farm Poljana, 43283 Kaniška Iva, Croatia
*Corresponding author:

ABSTRACT: This report describes a peripheral nerve sheath tumour in 8 European eels Anguilla anguilla L. from a fish farm located in Croatia. The newborn tissue appeared as smooth and soft skin nodules without pronounced colour change. Nodules were dome-shaped with a pale crater and were present on different body areas. In general, nodules were located as series of differently sized protrusions extending along the lateral line on both sides of the fish, as well as sensory canals on the head. Cut sections showed a homogeneous, pale white-grey texture. Histologically, the pathological tissue was located in the dermis, occasionally intruding into the hypodermis, and pushing as a space-occupying mass against the underlying muscle tissue without any evident boundaries. The pressure also caused changes in the overlying epidermis, such as atrophy, spongiosis and erosion. In some areas, the epidermis was 1 cell thick and club and goblet cells had completely disappeared. Ultimately, these changes resulted in shallow ulceration. Tumour tissue was characterized by a scant population of spindle or stellate cells, with oval, hyperchromatic nuclei and pale cytoplasm embedded in a copious myxoid matrix. Cells were arranged in fascicles and whorls, extending in a poorly defined manner among the dermal collagen bundles. Occasionally, adipose cells were also detected, mainly in the central portion of the bulges. Myxoid areas appeared rich in metachromatic and alcianophilic mucous ground substance. Reticular fibres and collagenous connective tissue were scarce. Immunohistochemistry (IHC) using antibodies against S-100 and glial fibrillary acidic protein caused a slight positive reaction in neoplastic dendritic cells. High magnification showed the immunostaining to be cytoplasmic in all tumour cells. IHC with anti-calretinin antibody gave only negative results. Macroscopic, histological, histochemical and immunohistochemical findings were consistent with a diagnosis of multicentric myxoma of the dermal nerve sheaths, a tumour not yet reported in fish.


KEY WORDS: Myxoma · Anguilla anguilla · Peripheral nerve sheath tumour · PNST


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Cite this article as: Gjurčević E, Kužir S, Sfacteria A, Drašner K, Marino F (2014) Spontaneous multicentric myxoma of the dermal nerve sheaths in farmed European eels Anguilla anguilla. Dis Aquat Org 111:173-176. https://doi.org/10.3354/dao02746

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